#pragma once
#include<semaphore.h>
#include<iostream>
#include<vector>
#include"LockGuard.hpp"
const int defaultsize=5;
template<class T>
class RingQueue
{
    private:
    void P(sem_t &sem)
    {
        sem_wait(&sem);
    }
    void V(sem_t&sem)
    {
        sem_post(&sem);
    }
    public:
    RingQueue(int size=defaultsize)
    :_ringqueue(size)
    ,_size(size)
    ,_p_step(0)
    ,_c_step(0)
    {
        sem_init(&_space_sem,0,_size);
        sem_init(&_data_sem,0,0);
        pthread_mutex_init(&_p_mutex,nullptr);
        pthread_mutex_init(&_c_mutex,nullptr);
    }
    void Push(const T&in)
    {
        P(_space_sem);
        {
        LockGuard lockguard(&_p_mutex);
        _ringqueue[_p_step]=in;
        _p_step++;
        _p_step%=_size;
        }
        V(_data_sem);
    }
    void Pop(T*out)
    {
        P(_data_sem);
        {
        LockGuard lockguard(&_c_mutex);
        *out=_ringqueue[_c_step];
        _c_step++;
        _c_step%=_size;
        }
        V(_space_sem);
    }
    ~RingQueue()
    {
        sem_destroy(&_space_sem);
        sem_destroy(&_data_sem);
        pthread_mutex_destroy(&_p_mutex);
        pthread_mutex_destroy(&_c_mutex);

    }
    private:
    std::vector<T> _ringqueue;
    int _size;
    int _p_step;//生产位置
    int _c_step;
    sem_t _space_sem;
    sem_t _data_sem;
    pthread_mutex_t _p_mutex;
    pthread_mutex_t _c_mutex;
};